<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .content{
            box-sizing: border-box;
            width: 500px;
            height: 500px;
            padding: 150px;
            background-color: #dfa366;
        }

        .child{
            width: 200px;
            height: 200px;
            /*margin: 150px;*/

            background-color: green;
        }
    </style>

</head>
<body>
<div class="content">
    <div class="child">

    </div>
</div>
</body>
</html>